Illinois Klima and Average Počasí
Klima of Illinois: average temperatures, rainfall and seasons month by month.
Klima in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Měsíc | Avg high | Avg low | Déšťfall | Rating |
|---|---|---|---|---|
| leden | 1° | -7° | 62 mm | ★★☆☆☆ |
| únor | 8° | -3° | 20 mm | ★★★☆☆ |
| březen | 15° | 4° | 90 mm | ★★★☆☆ |
| duben | 19° | 9° | 135 mm | ★★★☆☆ |
| kvě | 24° | 13° | 100 mm | ★★★★☆ |
| červen | 28° | 19° | 117 mm | ★★★★☆ |
| červenec | 29° | 21° | 129 mm | ★★★★☆ |
| srpen | 29° | 19° | 75 mm | ★★★★☆ |
| září | 28° | 17° | 33 mm | ★★★★★ |
| říjen | 20° | 10° | 37 mm | ★★★★☆ |
| listopad | 12° | 4° | 79 mm | ★★★☆☆ |
| prosinec | 6° | -2° | 62 mm | ★★☆☆☆ |
Klima type: Kontinental. Zdroj: Open-Meteo archive (ERA5).
Recent extremes in Illinois
Vysokéest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Illinois compares s nearby places
Annual averages, and the difference against Illinois.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Gateway Arch National Park | 137 km | 15°C | +1°C warmer | 1156 mm |
| St. Louis | 137 km | 15°C | +1°C warmer | 1156 mm |
| Missouri | 255 km | 15°C | +1°C warmer | 1006 mm |
| Indianapolis | 298 km | 13°C | 1°C cooler | 1135 mm |
| Indiana | 298 km | 13°C | 1°C cooler | 1135 mm |
Klima by city in Illinois
1 cities mapped in this atlas
Klima by state park in Illinois
1 state and provincial parks mapped in this atlas
Klima by county in Illinois
1 counties mapped in this atlas
Klima by lake in Illinois
1 lakes mapped in this atlas
Nejlepší doba k návštěvě Illinois
Go in srpen, září and říjen. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: leden, únor and prosinec - expect the least comfortable mix of heat, cold or rain.
What this means for Illinois
Today is warmer than average for říjen. The forecast high of 25°C is 5.1°C above the 20°C typical for this month.
Déšť is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in červen do srpen.
The gap between the warmest and coldest month averages 29°C.
What do pack, what do skip
- neglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 19°C, so mornings feel nothing like afternoons
- If your dates are flexible, avoid leden, únor and prosinec - historically the least comfortable months here.
Shrnutí
Illinois is a state in Spojené státy. Illinois is a US state s hlavním městem Springfield. Má přibližně 12.6 million. Hlavním městem je Springfield.
Právě teď je 14°C (57°F) in Illinois s většinou jasno. Pocitová teplota je 13°C. Dnes se teploty pohybují od 7°C do 25°C. Pravděpodobnost srážek je 0%. Sightseeing conditions score 9.6/10 - výborné — vyrazte nyní.
Nejlepší doba k návštěvě Illinois is srpen, září and říjen. Podnebí je continental. leden, únor and prosinec tend do be the least comfortable months. červenec is the warmest month s average highs near 29°C, while leden is the coldest s lows near -7°C.
The closest major airport is O'Hare International Airport (ORD), about 284 km away. Nearby highlights include Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
Jednoduše řečeno. Today is warmer than average for říjen. The forecast high of 25°C is 5.1°C above the 20°C typical for this month. The best window do be outside is roughly 11 AM do 2 PM, when temperature, rain chance and wind line up best. hiking is the strongest bet in Illinois today at 9.8/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Illinois
| Typ | State |
|---|---|
| Země | Spojené státy |
| Kontinent | Severní Amerika |
| Souřadnice | 39°46′54.1″N 89°39′0.4″W (39.7817, -89.6501) |
| Capital | Springfield |
| Obyvatelstvo | 12.600.000 |
| Area | 149.995 km² |
| Abbreviation | IL |
| Časové pásmo | America/Chicago |
| Místní čas | 3:43 AM (UTC-05:00) |
| Best months | srpen, září and říjen |
| Klima | Kontinental |
Počasí map for Illinois
Animated model layers. Pick a layer do load it.
Animated layers by Vítry. For pin-level detail and nearby places, see the interactive map below.
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Klima for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in Spojené státy. Its coordinates are 39.7817, -89.6501. It lies in Severní Amerika.
What is the weather like in Illinois právě teď?
It is currently 14°C (57°F) s většinou jasno. Vlhkost is 71% and wind is 7 km/h.
When is the best time do visit Illinois?
srpen, září and říjen offer the most comfortable conditions in Illinois, which has a continental climate. leden, únor and prosinec are usually the hardest months for outdoor plans.
What time zone is Illinois in?
Illinois observes America/Chicago (UTC-05:00). The local time is 3:43 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport do Illinois?
The closest airports are O'Hare International Airport (ORD), 284 km away and Nashville International Airport (BNA), 483 km away.
What are the top things do do in Illinois?
Popular options include Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
What places are in Illinois?
Illinois covers 4 places in this atlas, including Chicago, Starved Rock State Park, Cook County and Lake Michigan.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (us-states) - coordinates, hierarchy and facts. |
|---|---|
| Předpověď and observations | Open-Meteo (ECMWF and national models). |
| Kvalita ovzduší and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Klima averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Počasí Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated říjen 26, 2026 at 3:43 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
